If it's not what You are looking for type in the equation solver your own equation and let us solve it.
x in (-oo:+oo)
-x = 3/8 // - 3/8
-x-(3/8) = 0
-x-3/8 = 0
-x-3/8 = 0 // + 3/8
-x = 3/8 // * -1
x = -3/8
x = -3/8
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